An image lens assembly system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The first lens element with negative refractive power has a convex object-side surface. The second lens element has positive refractive power. The third lens element has refractive power. The fourth lens element has refractive power. The fifth lens element has refractive power. The sixth lens element with refractive power is made of plastic material, wherein at least one surface of the sixth lens element is aspheric. The seventh lens element with refractive power made of plastic material has a concave image-side surface changing from concave in a paraxial region to convex in a peripheral region, and at least one surface thereof is aspheric.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The image lens assembly system of claim 1 , wherein the image-side surface of the seventh lens element is concave in a paraxial region thereof and comprises at least one convex surface in an off-axis region thereof.
3. The image lens assembly system of claim 1 , wherein the seventh lens element has negative refractive power.
4. The image lens assembly system of claim 1 , wherein the second lens element has positive refractive power.
5. The image lens assembly system of claim 1 , wherein the second lens element has an object-side surface being convex in a paraxial region thereof, at least one of an object-side surface and an image-side surface of the fifth lens element is aspheric, and at least one of an object-side surface and an image-side surface of the sixth lens element is aspheric.
6. The image lens assembly system of claim 1 , wherein the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element are made of plastic materials.
7. The image lens assembly system of claim 1 , wherein there is a gap between every two adjacent lens elements of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, and the seventh lens element.
14. The image lens assembly system of claim 1 , wherein at least one of the third lens element and the fourth lens element has at least one concave-to-convex or convex-to-concave surface change from a paraxial region thereof to an off-axis region thereof.
16. The image lens assembly system of claim 15 , wherein the seventh lens element has negative refractive power.
17. The image lens assembly system of claim 15 , wherein the second lens element has positive refractive power.
18. The image lens assembly system of claim 15 , wherein the fourth lens element has positive refractive power.
19. The image lens assembly system of claim 15 , wherein the third lens element has an image-side surface being concave in a paraxial region thereof.
24. The image lens assembly system of claim 15 , wherein the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, and the seventh lens element are made of plastic materials.
25. The image lens assembly system of claim 15 , wherein at least one of the third lens element and the fourth lens element has at least one concave-to-convex or convex-to-concave surface change from a paraxial region thereof to an off-axis region thereof.
26. The image lens assembly system of claim 15 , wherein the image-side surface of the seventh lens element is concave in a paraxial region thereof and comprises at least one convex surface in an off-axis region thereof.
27. The image lens assembly system of claim 15 , wherein the object-side surface of the seventh lens element comprises at least one concave surface in an off-axis region thereof.
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October 30, 2017
October 16, 2018
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